2005 BMW 745i clock

Downloaded from www.Manualslib.com manuals search engine Valvetronic Motors
One Valvetronic motor is located on top of each
cylinder head towards the inside of the engine
“V”. The motors are capable of traveling from
minimum to maximum lift in 300 milli-seconds.
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The Valvetronic motor must first be removed in order to remove the cylinder head
cover. The eccentric shaft must be in the minimum lift position and the motor must be
wound out from the eccentric shaft. The worm gear could otherwise be damaged when
separating the worm shaft and the worm wheel as the eccentric shaft springs back (due to
the torque compensation spring).
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The Valvetronic motor worm gear rotates the
eccentric shaft clockwise or counterclockwise
at a very quick rate (1).
Due to the progressive “lobe” on the eccentric
shaft, this rotation positions the intermediate
lever (2) closer or further to the camshaft lobe.
N No
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26
N62 Engine
1
2
Valvetronic Motor
1. Cylinder Head Cover, Cylinder Bank 1-4
2. Valvetronic Motor for Eccentric Shaft Adjustment
42-02-2943-22-28

Downloaded from www.Manualslib.com manuals search engine 28
N62 Engine
Valve Lift
The Valvetronic motor worm gear rotates the eccen-
tric shaft clockwise or counterclockwise at a very
quick rate (1).
Due to the progressive “lobe” on the eccentric shaft,
this rotation positions the intermediate lever (2) closer
or further to the camshaft lobe.
As the camshaft is rotating (3), the cam lobe will pivot
the intermediate lever (4) and the “heel” of the inter-
mediate lever will depress the roller finger. A spring is
located on each intermediate lever to maintain con-
stant contact with the camshaft.
The roller finger is cushioned by the HVA and will open
the intake valve (5).
The Valvetronic system varies the valve opening lift
between 0.3 mm and 9.85 mm by rotating the eccen-
tric shaft during engine operation to increase or
decrease intake (flow) into the cylinder based on throt-
tle request.
* This is an assembly that affects all of the intake
valves (per cylinder head) to work in unison.
N No
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1
2
3
4
5

Downloaded from www.Manualslib.com manuals search engine 32
N62 Engine
H Hy
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When oil pressure is applied to chamber A, the blades are forced away from the VANOS
housing (counterclockwise). The blades are keyed into the hub which results in the hub
position being rotated in relation to the housing (with sprocket). The hub is secured to the
camshaft which changes the camshaft to sprocket relationship (timing).
The example below shows the a ad
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procedure together with the pressure progres-
sion based on the VANOS unit for the exhaust camshafts.
During this adjustment chamber B is open (through the solenoid) to allow the oil to drain
back through the cylinder head (internal reservoir).
Hydraulic Actuation - Chamber A
1. Front View of Vanos Unit 5. Engine Oil Pump
2. Side View of Vanos Unit 6. Supplied Oil from Pump (Switched Through Solenoid)
3. Camshaft Oil Port (Chamber B) 7. Supplied Oil Pressure (From Engine Oil Pump)
4. Solenoid Valve43-02-45

Downloaded from www.Manualslib.com manuals search engine 33
N62 Engine
When the solenoid valve switches over, oil pressure is applied to chamber B. This forces
the blades (and hub) in a clockwise direction back to the initial position, again changing the
camshaft timing.
The example below shows the r re
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t
procedure together with the pressure progression
based on the VANOS unit for the exhaust camshafts.
During this adjustment chamber A is open (through the solenoid) to allow the oil to drain
back through the cylinder head (internal reservoir).
N No
ot
te
es
s:
:

42-02-44 Hydraulic Actuation - Chamber B
1. Front View of VANOS Unit 5. Engine Oil Pump
2. Side View of VANOS Unit 6. Oil Return (Switched through Solenoid)
3. Camshaft Oil Port (Chamber B) 7. Supplied Oil Pressure (From Engine Oil Pump)
4. Solenoid Valve